Theorem eupthp1 41384

Description: Append one path segment to an Eulerian path ⟨𝐹, 𝑃⟩ to become an Eulerian path ⟨𝐻, 𝑄⟩ of the supergraph 𝑆 obtained by adding the new edge to the graph 𝐺. (Contributed by Mario Carneiro, 7-Apr-2015.) (Revised by AV, 7-Mar-2021.)

Hypotheses

Ref	Expression
eupthp1.v	⊢ 𝑉 = (Vtx‘𝐺)
eupthp1.i	⊢ 𝐼 = (iEdg‘𝐺)
eupthp1.f	⊢ (𝜑 → Fun 𝐼)
eupthp1.a	⊢ (𝜑 → 𝐼 ∈ Fin)
eupthp1.b	⊢ (𝜑 → 𝐵 ∈ V)
eupthp1.c	⊢ (𝜑 → 𝐶 ∈ 𝑉)
eupthp1.d	⊢ (𝜑 → ¬ 𝐵 ∈ dom 𝐼)
eupthp1.p	⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃)
eupthp1.n	⊢ 𝑁 = (#‘𝐹)
eupthp1.e	⊢ (𝜑 → 𝐸 ∈ (Edg‘𝐺))
eupthp1.x	⊢ (𝜑 → {(𝑃‘𝑁), 𝐶} ⊆ 𝐸)
eupthp1.u	⊢ (iEdg‘𝑆) = (𝐼 ∪ {⟨𝐵, 𝐸⟩})
eupthp1.h	⊢ 𝐻 = (𝐹 ∪ {⟨𝑁, 𝐵⟩})
eupthp1.q	⊢ 𝑄 = (𝑃 ∪ {⟨(𝑁 + 1), 𝐶⟩})
eupthp1.s	⊢ (Vtx‘𝑆) = 𝑉
eupthp1.l	⊢ ((𝜑 ∧ 𝐶 = (𝑃‘𝑁)) → 𝐸 = {𝐶})

Assertion

Ref	Expression
eupthp1	⊢ (𝜑 → 𝐻(EulerPaths‘𝑆)𝑄)

Proof of Theorem eupthp1

Step	Hyp	Ref	Expression
1		eupthp1.v	. . 3 ⊢ 𝑉 = (Vtx‘𝐺)
2		eupthp1.i	. . 3 ⊢ 𝐼 = (iEdg‘𝐺)
3		eupthp1.f	. . 3 ⊢ (𝜑 → Fun 𝐼)
4		eupthp1.a	. . 3 ⊢ (𝜑 → 𝐼 ∈ Fin)
5		eupthp1.b	. . 3 ⊢ (𝜑 → 𝐵 ∈ V)
6		eupthp1.c	. . 3 ⊢ (𝜑 → 𝐶 ∈ 𝑉)
7		eupthp1.d	. . 3 ⊢ (𝜑 → ¬ 𝐵 ∈ dom 𝐼)
8		eupthp1.p	. . . 4 ⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃)
9		eupthis1wlk 41380	. . . 4 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → 𝐹(1Walks‘𝐺)𝑃)
10	8, 9	syl 17	. . 3 ⊢ (𝜑 → 𝐹(1Walks‘𝐺)𝑃)
11		eupthp1.n	. . 3 ⊢ 𝑁 = (#‘𝐹)
12		eupthp1.e	. . 3 ⊢ (𝜑 → 𝐸 ∈ (Edg‘𝐺))
13		eupthp1.x	. . 3 ⊢ (𝜑 → {(𝑃‘𝑁), 𝐶} ⊆ 𝐸)
14		eupthp1.u	. . . 4 ⊢ (iEdg‘𝑆) = (𝐼 ∪ {⟨𝐵, 𝐸⟩})
15	14	a1i 11	. . 3 ⊢ (𝜑 → (iEdg‘𝑆) = (𝐼 ∪ {⟨𝐵, 𝐸⟩}))
16		eupthp1.h	. . 3 ⊢ 𝐻 = (𝐹 ∪ {⟨𝑁, 𝐵⟩})
17		eupthp1.q	. . 3 ⊢ 𝑄 = (𝑃 ∪ {⟨(𝑁 + 1), 𝐶⟩})
18		eupthp1.s	. . . 4 ⊢ (Vtx‘𝑆) = 𝑉
19	18	a1i 11	. . 3 ⊢ (𝜑 → (Vtx‘𝑆) = 𝑉)
20		eupthp1.l	. . 3 ⊢ ((𝜑 ∧ 𝐶 = (𝑃‘𝑁)) → 𝐸 = {𝐶})
21	1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15, 16, 17, 19, 20	1wlkp1 40890	. 2 ⊢ (𝜑 → 𝐻(1Walks‘𝑆)𝑄)
22	2	eupthi 41371	. . . . 5 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → (𝐹(1Walks‘𝐺)𝑃 ∧ 𝐹:(0..^(#‘𝐹))–1-1-onto→dom 𝐼))
23	11	eqcomi 2619	. . . . . . . . 9 ⊢ (#‘𝐹) = 𝑁
24	23	oveq2i 6560	. . . . . . . 8 ⊢ (0..^(#‘𝐹)) = (0..^𝑁)
25		f1oeq2 6041	. . . . . . . 8 ⊢ ((0..^(#‘𝐹)) = (0..^𝑁) → (𝐹:(0..^(#‘𝐹))–1-1-onto→dom 𝐼 ↔ 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼))
26	24, 25	ax-mp 5	. . . . . . 7 ⊢ (𝐹:(0..^(#‘𝐹))–1-1-onto→dom 𝐼 ↔ 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
27	26	biimpi 205	. . . . . 6 ⊢ (𝐹:(0..^(#‘𝐹))–1-1-onto→dom 𝐼 → 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
28	27	adantl 481	. . . . 5 ⊢ ((𝐹(1Walks‘𝐺)𝑃 ∧ 𝐹:(0..^(#‘𝐹))–1-1-onto→dom 𝐼) → 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
29	8, 22, 28	3syl 18	. . . 4 ⊢ (𝜑 → 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
30		fvex 6113	. . . . . . 7 ⊢ (#‘𝐹) ∈ V
31	11, 30	eqeltri 2684	. . . . . 6 ⊢ 𝑁 ∈ V
32		f1osng 6089	. . . . . 6 ⊢ ((𝑁 ∈ V ∧ 𝐵 ∈ V) → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵})
33	31, 5, 32	sylancr 694	. . . . 5 ⊢ (𝜑 → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵})
34		dmsnopg 5524	. . . . . . 7 ⊢ (𝐸 ∈ (Edg‘𝐺) → dom {⟨𝐵, 𝐸⟩} = {𝐵})
35	12, 34	syl 17	. . . . . 6 ⊢ (𝜑 → dom {⟨𝐵, 𝐸⟩} = {𝐵})
36	35	f1oeq3d 6047	. . . . 5 ⊢ (𝜑 → ({⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩} ↔ {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵}))
37	33, 36	mpbird 246	. . . 4 ⊢ (𝜑 → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩})
38		fzodisjsn 12374	. . . . 5 ⊢ ((0..^𝑁) ∩ {𝑁}) = ∅
39	38	a1i 11	. . . 4 ⊢ (𝜑 → ((0..^𝑁) ∩ {𝑁}) = ∅)
40	35	ineq2d 3776	. . . . 5 ⊢ (𝜑 → (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∩ {𝐵}))
41		disjsn 4192	. . . . . 6 ⊢ ((dom 𝐼 ∩ {𝐵}) = ∅ ↔ ¬ 𝐵 ∈ dom 𝐼)
42	7, 41	sylibr 223	. . . . 5 ⊢ (𝜑 → (dom 𝐼 ∩ {𝐵}) = ∅)
43	40, 42	eqtrd 2644	. . . 4 ⊢ (𝜑 → (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = ∅)
44		f1oun 6069	. . . 4 ⊢ (((𝐹:(0..^𝑁)–1-1-onto→dom 𝐼 ∧ {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩}) ∧ (((0..^𝑁) ∩ {𝑁}) = ∅ ∧ (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = ∅)) → (𝐹 ∪ {⟨𝑁, 𝐵⟩}):((0..^𝑁) ∪ {𝑁})–1-1-onto→(dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
45	29, 37, 39, 43, 44	syl22anc 1319	. . 3 ⊢ (𝜑 → (𝐹 ∪ {⟨𝑁, 𝐵⟩}):((0..^𝑁) ∪ {𝑁})–1-1-onto→(dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
46	16	a1i 11	. . . 4 ⊢ (𝜑 → 𝐻 = (𝐹 ∪ {⟨𝑁, 𝐵⟩}))
47	1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15, 16	1wlkp1lem2 40883	. . . . . 6 ⊢ (𝜑 → (#‘𝐻) = (𝑁 + 1))
48	47	oveq2d 6565	. . . . 5 ⊢ (𝜑 → (0..^(#‘𝐻)) = (0..^(𝑁 + 1)))
49		1wlkcl 40820	. . . . . . . 8 ⊢ (𝐹(1Walks‘𝐺)𝑃 → (#‘𝐹) ∈ ℕ0)
50	11	eleq1i 2679	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ0 ↔ (#‘𝐹) ∈ ℕ0)
51		elnn0uz 11601	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ0 ↔ 𝑁 ∈ (ℤ≥‘0))
52	50, 51	sylbb1 226	. . . . . . . 8 ⊢ ((#‘𝐹) ∈ ℕ0 → 𝑁 ∈ (ℤ≥‘0))
53	49, 52	syl 17	. . . . . . 7 ⊢ (𝐹(1Walks‘𝐺)𝑃 → 𝑁 ∈ (ℤ≥‘0))
54	8, 9, 53	3syl 18	. . . . . 6 ⊢ (𝜑 → 𝑁 ∈ (ℤ≥‘0))
55		fzosplitsn 12442	. . . . . 6 ⊢ (𝑁 ∈ (ℤ≥‘0) → (0..^(𝑁 + 1)) = ((0..^𝑁) ∪ {𝑁}))
56	54, 55	syl 17	. . . . 5 ⊢ (𝜑 → (0..^(𝑁 + 1)) = ((0..^𝑁) ∪ {𝑁}))
57	48, 56	eqtrd 2644	. . . 4 ⊢ (𝜑 → (0..^(#‘𝐻)) = ((0..^𝑁) ∪ {𝑁}))
58		dmun 5253	. . . . 5 ⊢ dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩})
59	58	a1i 11	. . . 4 ⊢ (𝜑 → dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
60	46, 57, 59	f1oeq123d 6046	. . 3 ⊢ (𝜑 → (𝐻:(0..^(#‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) ↔ (𝐹 ∪ {⟨𝑁, 𝐵⟩}):((0..^𝑁) ∪ {𝑁})–1-1-onto→(dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩})))
61	45, 60	mpbird 246	. 2 ⊢ (𝜑 → 𝐻:(0..^(#‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}))
62	1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15, 16, 17, 19	1wlkp1lem4 40885	. . 3 ⊢ (𝜑 → (𝑆 ∈ V ∧ 𝐻 ∈ V ∧ 𝑄 ∈ V))
63	14	eqcomi 2619	. . . 4 ⊢ (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (iEdg‘𝑆)
64	63	iseupthf1o 41369	. . 3 ⊢ ((𝑆 ∈ V ∧ 𝐻 ∈ V ∧ 𝑄 ∈ V) → (𝐻(EulerPaths‘𝑆)𝑄 ↔ (𝐻(1Walks‘𝑆)𝑄 ∧ 𝐻:(0..^(#‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}))))
65	62, 64	syl 17	. 2 ⊢ (𝜑 → (𝐻(EulerPaths‘𝑆)𝑄 ↔ (𝐻(1Walks‘𝑆)𝑄 ∧ 𝐻:(0..^(#‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}))))
66	21, 61, 65	mpbir2and 959	1 ⊢ (𝜑 → 𝐻(EulerPaths‘𝑆)𝑄)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  Vcvv 3173   ∪ cun 3538   ∩ cin 3539   ⊆ wss 3540  ∅c0 3874  {csn 4125  {cpr 4127  ⟨cop 4131   class class class wbr 4583  dom cdm 5038  Fun wfun 5798  –1-1-onto→wf1o 5803  ‘cfv 5804  (class class class)co 6549  Fincfn 7841  0cc0 9815  1c1 9816   + caddc 9818  ℕ₀cn0 11169  ℤ_≥cuz 11563  ..^cfzo 12334  #chash 12979  Vtxcvtx 25673  iEdgciedg 25674  Edgcedga 25792  1Walksc1wlks 40796  EulerPathsceupth 41364

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-ifp 1007  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-er 7629  df-map 7746  df-pm 7747  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-card 8648  df-cda 8873  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-fzo 12335  df-hash 12980  df-word 13154  df-1wlks 40800  df-trls 40901  df-eupth 41365

This theorem is referenced by:  eupth2eucrct  41385